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DNA Damage Regulates Translation through ?-TRCP Targeting of CReP.

ABSTRACT: The Skp1-Cul1-F box complex (SCF) associates with any one of a number of F box proteins, which serve as substrate binding adaptors. The human F box protein ?TRCP directs the conjugation of ubiquitin to a variety of substrate proteins, leading to the destruction of the substrate by the proteasome. To identify ?TRCP substrates, we employed a recently-developed technique, called Ligase Trapping, wherein a ubiquitin ligase is fused to a ubiquitin-binding domain to "trap" ubiquitinated substrates. 88% of the candidate substrates that we examined were bona fide substrates, comprising twelve previously validated substrates, eleven new substrates and three false positives. One ?TRCP substrate, CReP, is a Protein Phosphatase 1 (PP1) specificity subunit that targets the translation initiation factor eIF2? to promote the removal of a stress-induced inhibitory phosphorylation and increase cap-dependent translation. We found that CReP is targeted by ?TRCP for degradation upon DNA damage. Using a stable CReP allele, we show that depletion of CReP is required for the full induction of eIF2? phosphorylation upon DNA damage, and contributes to keeping the levels of translation low as cells recover from DNA damage.

SUBMITTER: Loveless TB

PROVIDER: S-EPMC4474599 | biostudies-literature | 2015 Jun

REPOSITORIES: biostudies-literature

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DNA Damage Regulates Translation through β-TRCP Targeting of CReP.

Loveless Theresa B TB Topacio Benjamin R BR Vashisht Ajay A AA Galaang Shastyn S Ulrich Katie M KM Young Brian D BD Wohlschlegel James A JA Toczyski David P DP

PLoS genetics 20150619 6

The Skp1-Cul1-F box complex (SCF) associates with any one of a number of F box proteins, which serve as substrate binding adaptors. The human F box protein βTRCP directs the conjugation of ubiquitin to a variety of substrate proteins, leading to the destruction of the substrate by the proteasome. To identify βTRCP substrates, we employed a recently-developed technique, called Ligase Trapping, wherein a ubiquitin ligase is fused to a ubiquitin-binding domain to "trap" ubiquitinated substrates. 88 ...[more]

PMID: 26091241

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Project description:Recent reports have made important revelations, uncovering direct regulation of DNA damage response (DDR)-associated proteins and chromatin ubiquitination (Ubn) by macroautophagy/autophagy. Here, we report a previously unexplored connection between autophagy and DDR, via a deubiquitnase (DUB), USP14. Loss of autophagy in prostate cancer cells led to unrepaired DNA double-strand breaks (DSBs) as indicated by persistent ionizing radiation (IR)-induced foci (IRIF) formation for ?H2AFX, and decreased protein levels and IRIF formation for RNF168, an E3-ubiquitin ligase essential for chromatin Ubn and recruitment of critical DDR effector proteins in response to DSBs, including TP53BP1. Consistently, RNF168-associated Ubn signaling and TP53BP1 IRIF formation were reduced in autophagy-deficient cells. An activity assay identified several DUBs, including USP14, which showed higher activity in autophagy-deficient cells. Importantly, inhibiting USP14 could overcome DDR defects in autophagy-deficient cells. USP14 IRIF formation and protein stability were increased in autophagy-deficient cells. Co-immunoprecipitation and colocalization of USP14 with MAP1LC3B and the UBA-domain of SQSTM1 identified USP14 as a substrate of autophagy and SQSTM1. Additionally, USP14 directly interacted with RNF168, which depended on the MIU1 domain of RNF168. These findings identify USP14 as a novel substrate of autophagy and regulation of RNF168-dependent Ubn and TP53BP1 recruitment by USP14 as a critical link between DDR and autophagy. Given the role of Ubn signaling in non-homologous end joining (NHEJ), the major pathway for repair of IR-induced DNA damage, these findings provide unique insights into the link between autophagy, DDR-associated Ubn signaling and NHEJ DNA repair.AbbreviationsATG7: autophagy related 7; CQ: chloroquine; DDR: DNA damage response; DUB: deubiquitinase; HR: homologous recombination; IR: ionizing radiation; IRIF: ionizing radiation-induced foci; LAMP2: lysosomal associated membrane protein 2; MAP1LC3B/LC3B: microtubule associated protein 1 light chain 3 beta; MIU1: motif interacting with ubiquitin; NHEJ: non homologous end-joining; PCa: prostate cancer; TP53BP1/53BP1: tumor protein p53 binding protein 1; RNF168: ring finger protein 168; SQSTM1/p62 sequestosome 1; ?H2AFX/?H2AX: H2A histone family member X: phosphorylated, UBA: ubiquitin-associated; Ub: ubiquitin; Ubn: ubiquitination; USP14: ubiquitin specific peptidase 14.

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DNA Damage Regulates Translation through ?-TRCP Targeting of CReP.

Publications

DNA Damage Regulates Translation through β-TRCP Targeting of CReP.

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